CVE-2019-12525
squid - security update
9.8
CRITICAL
CVSS 3.1
EPSS 54.6%
Description
An issue was discovered in Squid 3.3.9 through 3.5.28 and 4.x through 4.7. When Squid is configured to use Digest authentication, it parses the header Proxy-Authorization. It searches for certain tokens such as domain, uri, and qop. Squid checks if this token's value starts with a quote and ends with one. If so, it performs a memcpy of its length minus 2. Squid never checks whether the value is just a single quote (which would satisfy its requirements), leading to a memcpy of its length minus 1.
How to fix CVE-2019-12525
To remediate CVE-2019-12525, upgrade the affected package to a fixed version below.
- —upgrade to 4.8-r0 or later
- —upgrade to 4.8-1 or later
- —upgrade to 4.6-1+deb10u1 or later
- —upgrade to 3.4.8-6+deb8u8 or later
Is CVE-2019-12525 being exploited?
Likely — EPSS is 54.6%, placing CVE-2019-12525 in the top tier of vulnerabilities by exploitation probability. Prioritise patching.
Affected packages (4)
- from 0, < 4.8-r0
- from 0, < 4.8-1
- from 0, < 4.6-1+deb10u1
- from 0, < 3.4.8-6+deb8u8
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |